which of the following is most effective in coagulation of As2S3 sol?

Na3PO4, MgCl2, CaCl2, AlCl3

 As2S3 is a negatively charged sol, the negative charge is due to adsorption of S2- ions on the sol.
For coagulation wen nedd oppositely charged sol i.e. positively charged sol.
Also, accoding to Hardy-Schulz law which states : ‘the greater the valence of the flocculating ion, the greater will be its coagulating power’
Thus the most effective flocculant will be AlCl3 as Al has +3 charge on it.

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